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First let me apologize for taking so long to getting back to you. I am not getting notifications and I am buried in work. The listing in 2.1 should match what is in the source code for the chapter github. I know I did have to do some tweaking to show how to use an alternative Docker plugin. However, the code in github is always the latest and greatest code. Please let me know if you have find anything that seems out of wack between the example in the code and the example in the github repo.